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[dih-sen-ee-uh m]
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noun, plural de·cen·ni·ums, de·cen·ni·a [dih-sen-ee-uh] /dɪˈsɛn i ə/.
  1. a period of ten years; a decade.
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Origin of decennium

From Latin, dating back to 1675–85; see origin at decennial
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for decennium


decennary (dɪˈsɛnərɪ)

noun plural -niums, -nia (-nɪə) or -naries
  1. a less common word for decade (def. 1)
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Word Origin

C17: from Latin, from decem ten + annus year
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012